Hi Christophe,
On Sat, Aug 17, 2019 at 06:37:50PM +0000, Christophe Leroy wrote:
> #define BUG() do { \
> + __builtin_trap(); \
GCC will optimise away all code after this, it knows it is unreachable.
But you want to keep that BUG_ENTRY stuff I think?
The same will happen with a BUG_ON if the compiler can prove your
condition is always true.
> __asm__ __volatile__( \
> - "1: twi 31,0,0\n" \
> + "1:\n" \
> _EMIT_BUG_ENTRY \
> : : "i" (__FILE__), "i" (__LINE__), \
> "i" (0), "i" (sizeof(struct bug_entry))); \
(GCC wil generate a different trap btw; what is called "trap" as extended
mnemonic, that is, "tw 31,0,0", not the same thing as "twi", if that
matters for the exception handler).
Segher
